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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * omap_cf.c -- OMAP 16xx CompactFlash controller driver
4 *
5 * Copyright (c) 2005 David Brownell
6 */
7
8#include <linux/module.h>
9#include <linux/kernel.h>
10#include <linux/platform_device.h>
11#include <linux/errno.h>
12#include <linux/init.h>
13#include <linux/delay.h>
14#include <linux/interrupt.h>
15#include <linux/slab.h>
16
17#include <pcmcia/ss.h>
18
19#include <mach/hardware.h>
20#include <asm/io.h>
21#include <linux/sizes.h>
22
23#include <mach/mux.h>
24#include <mach/tc.h>
25
26
27/* NOTE: don't expect this to support many I/O cards. The 16xx chips have
28 * hard-wired timings to support Compact Flash memory cards; they won't work
29 * with various other devices (like WLAN adapters) without some external
30 * logic to help out.
31 *
32 * NOTE: CF controller docs disagree with address space docs as to where
33 * CF_BASE really lives; this is a doc erratum.
34 */
35#define CF_BASE 0xfffe2800
36
37/* status; read after IRQ */
38#define CF_STATUS (CF_BASE + 0x00)
39# define CF_STATUS_BAD_READ (1 << 2)
40# define CF_STATUS_BAD_WRITE (1 << 1)
41# define CF_STATUS_CARD_DETECT (1 << 0)
42
43/* which chipselect (CS0..CS3) is used for CF (active low) */
44#define CF_CFG (CF_BASE + 0x02)
45
46/* card reset */
47#define CF_CONTROL (CF_BASE + 0x04)
48# define CF_CONTROL_RESET (1 << 0)
49
50#define omap_cf_present() (!(omap_readw(CF_STATUS) & CF_STATUS_CARD_DETECT))
51
52/*--------------------------------------------------------------------------*/
53
54static const char driver_name[] = "omap_cf";
55
56struct omap_cf_socket {
57 struct pcmcia_socket socket;
58
59 struct timer_list timer;
60 unsigned present:1;
61 unsigned active:1;
62
63 struct platform_device *pdev;
64 unsigned long phys_cf;
65 u_int irq;
66 struct resource iomem;
67};
68
69#define POLL_INTERVAL (2 * HZ)
70
71/*--------------------------------------------------------------------------*/
72
73static int omap_cf_ss_init(struct pcmcia_socket *s)
74{
75 return 0;
76}
77
78/* the timer is primarily to kick this socket's pccardd */
79static void omap_cf_timer(struct timer_list *t)
80{
81 struct omap_cf_socket *cf = from_timer(cf, t, timer);
82 unsigned present = omap_cf_present();
83
84 if (present != cf->present) {
85 cf->present = present;
86 pr_debug("%s: card %s\n", driver_name,
87 present ? "present" : "gone");
88 pcmcia_parse_events(&cf->socket, SS_DETECT);
89 }
90
91 if (cf->active)
92 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
93}
94
95/* This irq handler prevents "irqNNN: nobody cared" messages as drivers
96 * claim the card's IRQ. It may also detect some card insertions, but
97 * not removals; it can't always eliminate timer irqs.
98 */
99static irqreturn_t omap_cf_irq(int irq, void *_cf)
100{
101 struct omap_cf_socket *cf = (struct omap_cf_socket *)_cf;
102
103 omap_cf_timer(&cf->timer);
104 return IRQ_HANDLED;
105}
106
107static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp)
108{
109 if (!sp)
110 return -EINVAL;
111
112 /* NOTE CF is always 3VCARD */
113 if (omap_cf_present()) {
114 struct omap_cf_socket *cf;
115
116 *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
117 cf = container_of(s, struct omap_cf_socket, socket);
118 s->pcmcia_irq = 0;
119 s->pci_irq = cf->irq;
120 } else
121 *sp = 0;
122 return 0;
123}
124
125static int
126omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
127{
128 u16 control;
129
130 /* REVISIT some non-OSK boards may support power switching */
131 switch (s->Vcc) {
132 case 0:
133 case 33:
134 break;
135 default:
136 return -EINVAL;
137 }
138
139 control = omap_readw(CF_CONTROL);
140 if (s->flags & SS_RESET)
141 omap_writew(CF_CONTROL_RESET, CF_CONTROL);
142 else
143 omap_writew(0, CF_CONTROL);
144
145 pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
146 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
147
148 return 0;
149}
150
151static int omap_cf_ss_suspend(struct pcmcia_socket *s)
152{
153 pr_debug("%s: %s\n", driver_name, __func__);
154 return omap_cf_set_socket(s, &dead_socket);
155}
156
157/* regions are 2K each: mem, attrib, io (and reserved-for-ide) */
158
159static int
160omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
161{
162 struct omap_cf_socket *cf;
163
164 cf = container_of(s, struct omap_cf_socket, socket);
165 io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
166 io->start = cf->phys_cf + SZ_4K;
167 io->stop = io->start + SZ_2K - 1;
168 return 0;
169}
170
171static int
172omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
173{
174 struct omap_cf_socket *cf;
175
176 if (map->card_start)
177 return -EINVAL;
178 cf = container_of(s, struct omap_cf_socket, socket);
179 map->static_start = cf->phys_cf;
180 map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
181 if (map->flags & MAP_ATTRIB)
182 map->static_start += SZ_2K;
183 return 0;
184}
185
186static struct pccard_operations omap_cf_ops = {
187 .init = omap_cf_ss_init,
188 .suspend = omap_cf_ss_suspend,
189 .get_status = omap_cf_get_status,
190 .set_socket = omap_cf_set_socket,
191 .set_io_map = omap_cf_set_io_map,
192 .set_mem_map = omap_cf_set_mem_map,
193};
194
195/*--------------------------------------------------------------------------*/
196
197/*
198 * NOTE: right now the only board-specific platform_data is
199 * "what chipselect is used". Boards could want more.
200 */
201
202static int __init omap_cf_probe(struct platform_device *pdev)
203{
204 unsigned seg;
205 struct omap_cf_socket *cf;
206 int irq;
207 int status;
208
209 seg = (int) pdev->dev.platform_data;
210 if (seg == 0 || seg > 3)
211 return -ENODEV;
212
213 /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
214 irq = platform_get_irq(pdev, 0);
215 if (irq < 0)
216 return -EINVAL;
217
218 cf = kzalloc(sizeof *cf, GFP_KERNEL);
219 if (!cf)
220 return -ENOMEM;
221 timer_setup(&cf->timer, omap_cf_timer, 0);
222
223 cf->pdev = pdev;
224 platform_set_drvdata(pdev, cf);
225
226 /* this primarily just shuts up irq handling noise */
227 status = request_irq(irq, omap_cf_irq, IRQF_SHARED,
228 driver_name, cf);
229 if (status < 0)
230 goto fail0;
231 cf->irq = irq;
232 cf->socket.pci_irq = irq;
233
234 switch (seg) {
235 /* NOTE: CS0 could be configured too ... */
236 case 1:
237 cf->phys_cf = OMAP_CS1_PHYS;
238 break;
239 case 2:
240 cf->phys_cf = OMAP_CS2_PHYS;
241 break;
242 case 3:
243 cf->phys_cf = omap_cs3_phys();
244 break;
245 default:
246 goto fail1;
247 }
248 cf->iomem.start = cf->phys_cf;
249 cf->iomem.end = cf->iomem.end + SZ_8K - 1;
250 cf->iomem.flags = IORESOURCE_MEM;
251
252 /* pcmcia layer only remaps "real" memory */
253 cf->socket.io_offset = (unsigned long)
254 ioremap(cf->phys_cf + SZ_4K, SZ_2K);
255 if (!cf->socket.io_offset)
256 goto fail1;
257
258 if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name))
259 goto fail1;
260
261 /* NOTE: CF conflicts with MMC1 */
262 omap_cfg_reg(W11_1610_CF_CD1);
263 omap_cfg_reg(P11_1610_CF_CD2);
264 omap_cfg_reg(R11_1610_CF_IOIS16);
265 omap_cfg_reg(V10_1610_CF_IREQ);
266 omap_cfg_reg(W10_1610_CF_RESET);
267
268 omap_writew(~(1 << seg), CF_CFG);
269
270 pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq);
271
272 /* NOTE: better EMIFS setup might support more cards; but the
273 * TRM only shows how to affect regular flash signals, not their
274 * CF/PCMCIA variants...
275 */
276 pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name,
277 seg, omap_readl(EMIFS_CCS(seg)), omap_readl(EMIFS_ACS(seg)));
278 omap_writel(0x0004a1b3, EMIFS_CCS(seg)); /* synch mode 4 etc */
279 omap_writel(0x00000000, EMIFS_ACS(seg)); /* OE hold/setup */
280
281 /* CF uses armxor_ck, which is "always" available */
282
283 pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name,
284 omap_readw(CF_STATUS), omap_readw(CF_CFG),
285 omap_readw(CF_CONTROL),
286 omap_cf_present() ? "present" : "(not present)");
287
288 cf->socket.owner = THIS_MODULE;
289 cf->socket.dev.parent = &pdev->dev;
290 cf->socket.ops = &omap_cf_ops;
291 cf->socket.resource_ops = &pccard_static_ops;
292 cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
293 | SS_CAP_MEM_ALIGN;
294 cf->socket.map_size = SZ_2K;
295 cf->socket.io[0].res = &cf->iomem;
296
297 status = pcmcia_register_socket(&cf->socket);
298 if (status < 0)
299 goto fail2;
300
301 cf->active = 1;
302 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
303 return 0;
304
305fail2:
306 release_mem_region(cf->phys_cf, SZ_8K);
307fail1:
308 if (cf->socket.io_offset)
309 iounmap((void __iomem *) cf->socket.io_offset);
310 free_irq(irq, cf);
311fail0:
312 kfree(cf);
313 return status;
314}
315
316static int __exit omap_cf_remove(struct platform_device *pdev)
317{
318 struct omap_cf_socket *cf = platform_get_drvdata(pdev);
319
320 cf->active = 0;
321 pcmcia_unregister_socket(&cf->socket);
322 del_timer_sync(&cf->timer);
323 iounmap((void __iomem *) cf->socket.io_offset);
324 release_mem_region(cf->phys_cf, SZ_8K);
325 free_irq(cf->irq, cf);
326 kfree(cf);
327 return 0;
328}
329
330static struct platform_driver omap_cf_driver = {
331 .driver = {
332 .name = driver_name,
333 },
334 .remove = __exit_p(omap_cf_remove),
335};
336
337static int __init omap_cf_init(void)
338{
339 if (cpu_is_omap16xx())
340 return platform_driver_probe(&omap_cf_driver, omap_cf_probe);
341 return -ENODEV;
342}
343
344static void __exit omap_cf_exit(void)
345{
346 if (cpu_is_omap16xx())
347 platform_driver_unregister(&omap_cf_driver);
348}
349
350module_init(omap_cf_init);
351module_exit(omap_cf_exit);
352
353MODULE_DESCRIPTION("OMAP CF Driver");
354MODULE_LICENSE("GPL");
355MODULE_ALIAS("platform:omap_cf");
1/*
2 * omap_cf.c -- OMAP 16xx CompactFlash controller driver
3 *
4 * Copyright (c) 2005 David Brownell
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/platform_device.h>
15#include <linux/errno.h>
16#include <linux/init.h>
17#include <linux/delay.h>
18#include <linux/interrupt.h>
19#include <linux/slab.h>
20
21#include <pcmcia/ss.h>
22
23#include <mach/hardware.h>
24#include <asm/io.h>
25#include <asm/sizes.h>
26
27#include <plat/mux.h>
28#include <plat/tc.h>
29
30
31/* NOTE: don't expect this to support many I/O cards. The 16xx chips have
32 * hard-wired timings to support Compact Flash memory cards; they won't work
33 * with various other devices (like WLAN adapters) without some external
34 * logic to help out.
35 *
36 * NOTE: CF controller docs disagree with address space docs as to where
37 * CF_BASE really lives; this is a doc erratum.
38 */
39#define CF_BASE 0xfffe2800
40
41/* status; read after IRQ */
42#define CF_STATUS (CF_BASE + 0x00)
43# define CF_STATUS_BAD_READ (1 << 2)
44# define CF_STATUS_BAD_WRITE (1 << 1)
45# define CF_STATUS_CARD_DETECT (1 << 0)
46
47/* which chipselect (CS0..CS3) is used for CF (active low) */
48#define CF_CFG (CF_BASE + 0x02)
49
50/* card reset */
51#define CF_CONTROL (CF_BASE + 0x04)
52# define CF_CONTROL_RESET (1 << 0)
53
54#define omap_cf_present() (!(omap_readw(CF_STATUS) & CF_STATUS_CARD_DETECT))
55
56/*--------------------------------------------------------------------------*/
57
58static const char driver_name[] = "omap_cf";
59
60struct omap_cf_socket {
61 struct pcmcia_socket socket;
62
63 struct timer_list timer;
64 unsigned present:1;
65 unsigned active:1;
66
67 struct platform_device *pdev;
68 unsigned long phys_cf;
69 u_int irq;
70 struct resource iomem;
71};
72
73#define POLL_INTERVAL (2 * HZ)
74
75/*--------------------------------------------------------------------------*/
76
77static int omap_cf_ss_init(struct pcmcia_socket *s)
78{
79 return 0;
80}
81
82/* the timer is primarily to kick this socket's pccardd */
83static void omap_cf_timer(unsigned long _cf)
84{
85 struct omap_cf_socket *cf = (void *) _cf;
86 unsigned present = omap_cf_present();
87
88 if (present != cf->present) {
89 cf->present = present;
90 pr_debug("%s: card %s\n", driver_name,
91 present ? "present" : "gone");
92 pcmcia_parse_events(&cf->socket, SS_DETECT);
93 }
94
95 if (cf->active)
96 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
97}
98
99/* This irq handler prevents "irqNNN: nobody cared" messages as drivers
100 * claim the card's IRQ. It may also detect some card insertions, but
101 * not removals; it can't always eliminate timer irqs.
102 */
103static irqreturn_t omap_cf_irq(int irq, void *_cf)
104{
105 omap_cf_timer((unsigned long)_cf);
106 return IRQ_HANDLED;
107}
108
109static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp)
110{
111 if (!sp)
112 return -EINVAL;
113
114 /* NOTE CF is always 3VCARD */
115 if (omap_cf_present()) {
116 struct omap_cf_socket *cf;
117
118 *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
119 cf = container_of(s, struct omap_cf_socket, socket);
120 s->pcmcia_irq = 0;
121 s->pci_irq = cf->irq;
122 } else
123 *sp = 0;
124 return 0;
125}
126
127static int
128omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
129{
130 u16 control;
131
132 /* REVISIT some non-OSK boards may support power switching */
133 switch (s->Vcc) {
134 case 0:
135 case 33:
136 break;
137 default:
138 return -EINVAL;
139 }
140
141 control = omap_readw(CF_CONTROL);
142 if (s->flags & SS_RESET)
143 omap_writew(CF_CONTROL_RESET, CF_CONTROL);
144 else
145 omap_writew(0, CF_CONTROL);
146
147 pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
148 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
149
150 return 0;
151}
152
153static int omap_cf_ss_suspend(struct pcmcia_socket *s)
154{
155 pr_debug("%s: %s\n", driver_name, __func__);
156 return omap_cf_set_socket(s, &dead_socket);
157}
158
159/* regions are 2K each: mem, attrib, io (and reserved-for-ide) */
160
161static int
162omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
163{
164 struct omap_cf_socket *cf;
165
166 cf = container_of(s, struct omap_cf_socket, socket);
167 io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
168 io->start = cf->phys_cf + SZ_4K;
169 io->stop = io->start + SZ_2K - 1;
170 return 0;
171}
172
173static int
174omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
175{
176 struct omap_cf_socket *cf;
177
178 if (map->card_start)
179 return -EINVAL;
180 cf = container_of(s, struct omap_cf_socket, socket);
181 map->static_start = cf->phys_cf;
182 map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
183 if (map->flags & MAP_ATTRIB)
184 map->static_start += SZ_2K;
185 return 0;
186}
187
188static struct pccard_operations omap_cf_ops = {
189 .init = omap_cf_ss_init,
190 .suspend = omap_cf_ss_suspend,
191 .get_status = omap_cf_get_status,
192 .set_socket = omap_cf_set_socket,
193 .set_io_map = omap_cf_set_io_map,
194 .set_mem_map = omap_cf_set_mem_map,
195};
196
197/*--------------------------------------------------------------------------*/
198
199/*
200 * NOTE: right now the only board-specific platform_data is
201 * "what chipselect is used". Boards could want more.
202 */
203
204static int __init omap_cf_probe(struct platform_device *pdev)
205{
206 unsigned seg;
207 struct omap_cf_socket *cf;
208 int irq;
209 int status;
210
211 seg = (int) pdev->dev.platform_data;
212 if (seg == 0 || seg > 3)
213 return -ENODEV;
214
215 /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
216 irq = platform_get_irq(pdev, 0);
217 if (irq < 0)
218 return -EINVAL;
219
220 cf = kzalloc(sizeof *cf, GFP_KERNEL);
221 if (!cf)
222 return -ENOMEM;
223 init_timer(&cf->timer);
224 cf->timer.function = omap_cf_timer;
225 cf->timer.data = (unsigned long) cf;
226
227 cf->pdev = pdev;
228 platform_set_drvdata(pdev, cf);
229
230 /* this primarily just shuts up irq handling noise */
231 status = request_irq(irq, omap_cf_irq, IRQF_SHARED,
232 driver_name, cf);
233 if (status < 0)
234 goto fail0;
235 cf->irq = irq;
236 cf->socket.pci_irq = irq;
237
238 switch (seg) {
239 /* NOTE: CS0 could be configured too ... */
240 case 1:
241 cf->phys_cf = OMAP_CS1_PHYS;
242 break;
243 case 2:
244 cf->phys_cf = OMAP_CS2_PHYS;
245 break;
246 case 3:
247 cf->phys_cf = omap_cs3_phys();
248 break;
249 default:
250 goto fail1;
251 }
252 cf->iomem.start = cf->phys_cf;
253 cf->iomem.end = cf->iomem.end + SZ_8K - 1;
254 cf->iomem.flags = IORESOURCE_MEM;
255
256 /* pcmcia layer only remaps "real" memory */
257 cf->socket.io_offset = (unsigned long)
258 ioremap(cf->phys_cf + SZ_4K, SZ_2K);
259 if (!cf->socket.io_offset)
260 goto fail1;
261
262 if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name))
263 goto fail1;
264
265 /* NOTE: CF conflicts with MMC1 */
266 omap_cfg_reg(W11_1610_CF_CD1);
267 omap_cfg_reg(P11_1610_CF_CD2);
268 omap_cfg_reg(R11_1610_CF_IOIS16);
269 omap_cfg_reg(V10_1610_CF_IREQ);
270 omap_cfg_reg(W10_1610_CF_RESET);
271
272 omap_writew(~(1 << seg), CF_CFG);
273
274 pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq);
275
276 /* NOTE: better EMIFS setup might support more cards; but the
277 * TRM only shows how to affect regular flash signals, not their
278 * CF/PCMCIA variants...
279 */
280 pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name,
281 seg, omap_readl(EMIFS_CCS(seg)), omap_readl(EMIFS_ACS(seg)));
282 omap_writel(0x0004a1b3, EMIFS_CCS(seg)); /* synch mode 4 etc */
283 omap_writel(0x00000000, EMIFS_ACS(seg)); /* OE hold/setup */
284
285 /* CF uses armxor_ck, which is "always" available */
286
287 pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name,
288 omap_readw(CF_STATUS), omap_readw(CF_CFG),
289 omap_readw(CF_CONTROL),
290 omap_cf_present() ? "present" : "(not present)");
291
292 cf->socket.owner = THIS_MODULE;
293 cf->socket.dev.parent = &pdev->dev;
294 cf->socket.ops = &omap_cf_ops;
295 cf->socket.resource_ops = &pccard_static_ops;
296 cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
297 | SS_CAP_MEM_ALIGN;
298 cf->socket.map_size = SZ_2K;
299 cf->socket.io[0].res = &cf->iomem;
300
301 status = pcmcia_register_socket(&cf->socket);
302 if (status < 0)
303 goto fail2;
304
305 cf->active = 1;
306 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
307 return 0;
308
309fail2:
310 release_mem_region(cf->phys_cf, SZ_8K);
311fail1:
312 if (cf->socket.io_offset)
313 iounmap((void __iomem *) cf->socket.io_offset);
314 free_irq(irq, cf);
315fail0:
316 kfree(cf);
317 return status;
318}
319
320static int __exit omap_cf_remove(struct platform_device *pdev)
321{
322 struct omap_cf_socket *cf = platform_get_drvdata(pdev);
323
324 cf->active = 0;
325 pcmcia_unregister_socket(&cf->socket);
326 del_timer_sync(&cf->timer);
327 iounmap((void __iomem *) cf->socket.io_offset);
328 release_mem_region(cf->phys_cf, SZ_8K);
329 free_irq(cf->irq, cf);
330 kfree(cf);
331 return 0;
332}
333
334static struct platform_driver omap_cf_driver = {
335 .driver = {
336 .name = (char *) driver_name,
337 .owner = THIS_MODULE,
338 },
339 .remove = __exit_p(omap_cf_remove),
340};
341
342static int __init omap_cf_init(void)
343{
344 if (cpu_is_omap16xx())
345 return platform_driver_probe(&omap_cf_driver, omap_cf_probe);
346 return -ENODEV;
347}
348
349static void __exit omap_cf_exit(void)
350{
351 if (cpu_is_omap16xx())
352 platform_driver_unregister(&omap_cf_driver);
353}
354
355module_init(omap_cf_init);
356module_exit(omap_cf_exit);
357
358MODULE_DESCRIPTION("OMAP CF Driver");
359MODULE_LICENSE("GPL");
360MODULE_ALIAS("platform:omap_cf");